Photo by Roger Brown / Pexels
Common Air Filter Sizes
Photo by Roger Brown / Pexels
Most residential HVAC systems use one of these standard filter sizes. Sizes are listed as Width x Height x Depth (inches).
| Size (W x H x D) | Actual Size | Common Use | Availability |
|---|
MERV Rating Guide
MERV (Minimum Efficiency Reporting Value) rates a filter's ability to capture particles. Higher MERV = finer filtration but more airflow restriction.
Filter Type Comparison
Choose the right filter type based on your needs, budget, and air quality goals.
Photo by Nishant Aneja / Pexels
Side-by-Side Comparison
Photo by Nishant Aneja / Pexels
| Feature | Fiberglass | Pleated | Electrostatic | HEPA |
|---|---|---|---|---|
| Cost | $1-5 | $5-15 | $15-40 | $40-200 |
| MERV Range | 1-4 | 5-13 | 8-12 | 17-20 |
| Lifespan | 30 days | 60-90 days | Washable | 12-18 months |
| Dust | Low | Good | Good | Excellent |
| Pollen | Poor | Good | Good | Excellent |
| Bacteria | Poor | Fair | Fair | Excellent |
| Airflow Impact | Minimal | Low-Moderate | Low | High |
| Eco-Friendly | No | No | Yes | No |
Replacement Schedule Calculator
Find out when you should replace your air filter based on your specific conditions.
Find Your Filter Size
Measure your existing filter or filter slot and enter the dimensions below. We'll find the nearest standard size.
How to Measure Your Filter
- Remove the existing filter from its slot
- Look for the nominal size printed on the frame (e.g. 16x25x1)
- If no size is printed, measure length, width, and depth with a tape measure
- Round to the nearest standard size — actual sizes are typically 0.25-0.5" smaller than nominal
- The first number is width, the second is height, and the third is depth